Mauritius (sometimes Mascus) appears as
Dean of Armagh
The Dean of Armagh in the Church of Ireland is the Dean (Christianity), dean of the St Patrick's Cathedral, Armagh (Church of Ireland), Anglican St Patrick's Cathedral, the cathedral of the Diocese of Armagh (Church of Ireland), Diocese of Armag ...
in 1238, the second recorded incumbent.
["Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton,H. p30 Dublin, Hodges & Smith, 1848-1878]
References
Deans of Armagh
13th-century Irish Roman Catholic priests
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